When building WebGL giving IOError: [Errno 0] Error

I want to build my game for WebGL but giving error. I searched everywhere but i couldn't get positive results. This is error.

Failed running "C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport/BuildTools/Emscripten_Win/python/2.7.5.3_64bit/python.exe" "C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport/BuildTools/Emscripten/emcc" @"C:/Users/Public/Documents/Unity Projects/koala/Assets/../Temp/emcc_arguments.resp"

stdout:
stderr:
warning: unresolved symbol: glProgramParameteri
warning: unresolved symbol: glFlushMappedBufferRange
warning: unresolved symbol: glGetInternalformativ
warning: unresolved symbol: glFenceSync
warning: unresolved symbol: pthread_create
warning: unresolved symbol: glDeleteSync
warning: unresolved symbol: _ZN4FMOD13DSPConnection6setMixEf
warning: unresolved symbol: glUnmapBuffer
warning: unresolved symbol: glGetStringi
warning: unresolved symbol: glProgramBinary
warning: unresolved symbol: glClientWaitSync
warning: unresolved symbol: glMapBufferRange
warning: unresolved symbol: glGetProgramBinary
warning: unresolved symbol: glCopyBufferSubData
Traceback (most recent call last):
File "C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport/BuildTools/Emscripten/emcc", line 1540, in <module>
flush_js_optimizer_queue()
File "C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport/BuildTools/Emscripten/emcc", line 1447, in flush_js_optimizer_queue
run_passes(chunks[0], title, just_split=False, just_concat=False)
File "C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport/BuildTools/Emscripten/emcc", line 1420, in run_passes
final = shared.Building.js_optimizer(final, passes, debug_level >= 4, js_optimizer_extra_info, just_split=just_split, just_concat=just_concat)
File "C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\shared.py", line 1578, in js_optimizer
ret = js_optimizer.run(filename, passes, NODE_JS, debug, extra_info, just_split, just_concat)
File "C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\js_optimizer.py", line 520, in run
return temp_files.run_and_clean(lambda: run_on_js(filename, passes, js_engine, source_map, extra_info, just_split, just_concat))
File "C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\tempfiles.py", line 39, in run_and_clean
return func()
File "C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\js_optimizer.py", line 520, in <lambda>
return temp_files.run_and_clean(lambda: run_on_js(filename, passes, js_engine, source_map, extra_info, just_split, just_concat))
File "C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\js_optimizer.py", line 414, in run_on_js
filenames = [write_chunk(chunks, i) for i in range(len(chunks))]
File "C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\js_optimizer.py", line 399, in write_chunk
f.write(chunk)
IOError: [Errno 0] Error

 

maybe you are out of disk space?

 

I have 2GB. My game is under the 100MB

 

i solved the problem. this error was because of some assets. when unistall this, it solved but if i encounter this problem again, i will report the bug. Thanks.